JP2022187727A - Press machine and press machine control method - Google Patents

Abstract

To achieve both of processing speed and process tolerance in a press machine.SOLUTION: A press machine (10) comprises: two opposite metal molds (11a, 11b) for pressing a work-piece; and a first drive part and a second drive part for driving at least one of two metal molds. The first drive part can be driven at a high speed compared to the second drive part, the second drive part can be driven with high accuracy compared to the first drive part, and a stop position of the metal mold, which is driven by the second drive part, is changed on the basis of drive situation of the first drive part.SELECTED DRAWING: Figure 1

Description

The present invention relates to presses.

There is a press that processes the workpiece by sandwiching the workpiece between upper and lower dies and applying compression force. There are various drive mechanisms and press mechanisms in press machines, each of which has advantages and disadvantages.

In Patent Document 1, in a press machine, a workpiece is pressed using a servomotor for moving a mold up and down at high speed. Further, when the load measured by the load cell is insufficient, the pressure is further increased by the hydraulic cylinder attached to the tip of the servomotor. That is, a press machine is disclosed in which servomotors and hydraulic cylinders are connected in multiple stages and the roles of the respective mechanisms are differentiated.

Patent Literature 2 discloses a press machine in which a workpiece is sandwiched between dies provided with a gap to confine the workpiece, and the workpiece in the gap is punched out by a punch driven by a separate drive mechanism. It is

Patent Literature 3 discloses a pressing machine capable of performing vertical movement of the entire die and high-speed driving of a part of the drive part in the die by synchronously controlling a plurality of servo motors in the press. there is

As described above, presses using a plurality of interlocking drive mechanisms are disclosed, and these presses are used for moving the entire die up and down, or for moving the entire die and a part of the die. can be used to operate individually.

JP 2012-55932 A JP 2011-224576 A JP 2006-142374 A

As a conventional press machine, there are a cam system in which a mold is moved up and down at high speed by driving a cam with a motor, and a servo press system in which a mold is moved up and down by a servomotor.

With the cam method, it is possible to increase the speed of the press cycle, but since the bottom dead center position of the die is mechanically determined by the cam, the press can be adjusted according to the profile according to the work or environment. Have difficulty.

On the other hand, in the servo press method, the stop position corresponding to the bottom dead center position of the die can be controlled with high precision, so it is possible to perform press adjusted by the profile according to the workpiece or environment. However, in the servo press method, it is necessary to increase the lead of the ball screw in order to operate at high speed, which leads to a decrease in accuracy.

That is, there is a trade-off relationship between the processing speed and the processing accuracy in the press machine. Accordingly, it is an object of one aspect of the present invention to realize a press that achieves both processing speed and processing accuracy.

In order to solve the above problems, a press according to one aspect of the present invention includes two dies facing each other for pressing a workpiece, and a second die for driving at least one of the two dies. a first driving section and a second driving section; and a control section for controlling the first driving section and the second driving section, wherein the first driving section can be driven at a higher speed than the second driving section. , the second driving section can be driven with higher precision than the first driving section, and the control section controls the mold driven by the second driving section based on the driving state of the first driving section. change the stop position of

According to the above configuration, one of the two molds can be driven at high speed by the first driving section. However, the precision of the stop position of the mold driven by the first driving section is low. Therefore, the stop position of the mold driven by the second driving section is changed based on the driving state of the first driving section. Thereby, the accuracy of the gap between the two molds can be improved. As a result, it is possible to achieve both processing speed and processing accuracy in the press machine.

One of the two molds may be driven by the first drive section, and the other of the two molds may be driven by the second drive section.

According to the above configuration, the two molds can be individually driven by the first driving section and the second driving section.

One of the two molds may be driven by the first driving section and the second driving section, and the other of the two molds may be fixed.

According to the above configuration, one of the two molds can be driven by the first driving section and the second driving section and pressed toward the other fixed mold.

The driving condition of the first driving section may be the position or speed of the mold driven by the first driving section.

According to the above configuration, the stop position of the second driving section can be changed based on the position or speed of the mold as the driving state of the first driving section.

The control section may stop the second driving section after the first driving section is stopped.

According to the above configuration, the gap error generated in the first drive section can be reduced by the second drive section that can operate with higher accuracy after the first drive section stops.

The control unit controls the stop position of the mold driven by the second drive unit to at least the yield stress or proof stress of the workpiece, the temperature of each of the two molds, the temperature of the workpiece, and the environmental temperature. Based on one, it may be changed.

According to the above configuration, it is possible to produce high-precision products by adjusting the stop position for each work in consideration of various temperatures, individual differences in thickness of the work, and the like.

The control section may change the stop position of the die driven by the second driving section at least once during one press.

According to the above configuration, the stop position can be dynamically changed during pressing for fine adjustment.

The control section may control a stop position of the mold driven by the first drive section.

According to the above configuration, the stop position of the mold driven by the first driving section can also be controlled. Therefore, it becomes easier to control the gap between the two molds.

In order to solve the above problems, a control method for a press according to another aspect of the present invention is a control method for a press provided with two dies facing each other for pressing a workpiece, The press includes a first drive section and a second drive section for driving at least one of the two dies, and a control section for controlling the first drive section and the second drive section, The first driving section can be driven at a higher speed than the second driving section, the second driving section can be driven with higher accuracy than the first driving section, and the driving status of the first driving section is acquired. and changing the stop position of the second driving section based on the driving situation.

According to the control method described above, the same effect as described above can be obtained.

According to one aspect of the present invention, it is possible to provide a press that achieves both processing speed and processing accuracy.

2 is a block diagram showing the configuration of the essential parts of the press according to Embodiment 1. FIG. 1 is a schematic diagram showing a mechanical configuration of a press according to Embodiment 1; FIG. 4 is a flow chart showing the operation flow of the press according to Embodiment 1. FIG. 4 is a graph showing changes in the positions of the first mold and the second mold according to Embodiment 1. FIG. 8 is another graph showing changes in the positions of the first mold and the second mold according to Embodiment 1. FIG. FIG. 5 is a schematic diagram showing the mechanical configuration of a press according to Embodiment 2; FIG. 11 is a block diagram showing the configuration of the main parts of a press according to Embodiment 3; FIG. 11 is a schematic diagram showing the mechanical configuration of a press according to Embodiment 3;

[Embodiment 1]
Hereinafter, an embodiment (hereinafter also referred to as "this embodiment") according to one aspect of the present invention will be described based on the drawings. The same or corresponding parts in the drawings are denoted by the same reference numerals, and the description thereof will not be repeated.

§1. APPLICATION EXAMPLE FIG. 1 is a block diagram showing the configuration of a main part of a press 10 according to the first embodiment. FIG. 2 is a schematic diagram showing the mechanical configuration of the press 10 according to Embodiment 1. As shown in FIG. The press machine 10 presses the workpiece 40 from above and below with a first mold 11a facing the upper surface of the workpiece 40 and a second mold 11b facing the lower surface of the workpiece.

The press machine 10 includes a first thermometer 14a for measuring the temperature of the first mold 11a, a second thermometer 14b for measuring the temperature of the second mold 11b, and a workpiece thermometer 15 for measuring the temperature of the workpiece. , an environmental thermometer 16 for measuring the environmental temperature, and a work thickness sensor 17 for measuring the thickness of the work before and after pressing (before and after processing). Therefore, when pressing, the press machine 10 finely adjusts the pressing amount for the work 40 based on various temperatures and the thickness of the work before processing, thereby processing a product with high precision.

The first mold 11a and/or the second mold 11b can be driven by a first drive and a second drive. The first drive section and the second drive section differ in drive speed and position accuracy. The first driving unit has a high driving speed in exchange for rough positional accuracy. On the other hand, the second driving section has a low driving speed but high positional accuracy. By using the first drive unit and the second drive unit having different characteristics, the press machine 10 can control the workpiece 40 to be compressed at high speed by the first drive unit and then adjusted to the desired dimensional accuracy by the second drive unit. can be processed into products.

§2. Configuration example (outline of press machine 10)
The press 10 includes a first mold 11a, a second mold 11b, a first servomotor 12a, a second servomotor 12b, a first ball screw 13a, a second ball screw 13b, and a first thermometer 14a. , a second thermometer 14 b , a workpiece thermometer 15 , an environmental thermometer 16 , a workpiece thickness sensor 17 , a main body 19 and a press controller 20 .

As shown in FIG. 2, the first mold 11a faces the upper surface of the workpiece 40, the second mold 11b faces the lower surface of the workpiece 40, and the first mold 11a and the second mold 11b are arranged between the first mold 11a and the second mold 11b. The workpiece 40 is sandwiched and an external force is applied to the workpiece 40 from above and below to press it. That is, the first mold 11a and the second mold 11b face each other.

(Mechanical configuration of press machine 10)
The main body 19 is a so-called housing, in which non-movable parts are fixed.

The first die 11 a and the second die 11 b are dies for actually pressing the workpiece 40 , and are shaped to apply an appropriate external force to the workpiece 40 .

The first servomotor 12a and the second servomotor 12b are motors whose stop positions can be controlled, and are fixed to the main body 19 . The first ball screw 13a and the second ball screw 13b are fixed in the vertical direction to the motor shafts of the first servomotor 12a and the second servomotor 12b, respectively, and each ball screw rotates according to the rotation of the motor. . The movable portion of the first ball screw 13a is fixed to the first die 11a, and the movable portion of the second ball screw 13b is fixed to the second die 11b.

The first mold 11a is moved up and down by the first driving section. That is, when the first servomotor 12a rotates, the first ball screw 13a rotates, and the first mold 11a is driven up and down by the first ball screw 13a. In addition, the second mold 11b moves up and down by the second driving section. That is, when the second servo motor 12b rotates, the second ball screw 13b rotates, and the second mold 11b is driven up and down by the second ball screw 13b.

Also, the first servomotor 12a and the first ball screw 13a together correspond to the first driving section. Together, the second servomotor 12b and the second ball screw 13b correspond to the second driving section.

The first ball screw 13a and the second ball screw 13b are not limited to ball screws, and may be any means for transmitting driving force such as a chain or pulleys and belts.

The lead of the second ball screw 13b is shorter than the lead of the first ball screw 13a. Also, the accuracy of the second ball screw 13b is higher than that of the first ball screw 13a. Therefore, the accuracy of the second die 11b by the second ball screw 13b has finer resolution and higher reproducibility than the accuracy of the first die 11a by the first ball screw 13a. That is, it can be said that the second driving section has higher accuracy than the first driving section. Also, the second servomotor 12b may be controlled with higher accuracy (higher resolution and/or higher repeatability) than the first servomotor 12a.

(Measuring instrument of press machine 10)
The first thermometer 14a and the second thermometer 14b are thermometers that measure the temperatures of the first mold 11a and the second mold 11b, respectively. Further, the work thermometer 15 is a thermometer for measuring the temperature of the work 40, and the environmental thermometer 16 is a thermometer for measuring the environmental temperature of the environment where the press machine 10 is installed. Furthermore, the work thickness sensor 17 measures the thickness of the work 40 before and after processing.

(Configuration of press controller 20)
The press controller 20 includes a position acquisition section 21 , a temperature acquisition section 22 , a thickness acquisition section 23 , a drive control section 24 and a control section 30 . The control unit 30 includes a sheet processing unit 31 and a stop position command unit 32 .

The position acquisition unit 21 acquires the positions of the respective motors from the respective encoders of the first servomotor 12a and the second servomotor 12b, considers the relationship with the respective ball screws, and determines the positions of the first die 11a and the second die 11a. Get the position of mold 11b.

The position acquisition unit 21 is not limited to acquiring positions from encoders. That is, it may be obtained from potentiometers or resolvers attached to the first and second servo motors. Further, from the linear encoders attached to the movable ends of the first and second drive sections (or the movable sections of the first ball screw 13a and the second ball screw 13b), the first mold 11a and the second mold 11b are directly connected. You can get the position. The position acquisition section 21 outputs the acquired position to the stop position command section 32 . The position acquisition unit 21 also outputs the position of each servomotor for feedback to the drive control unit 24 . Furthermore, the position acquisition unit 21 outputs the position to the sheet processing unit 31 and the stop position command unit 32 .

The temperature acquisition unit 22 acquires the temperature of each part from the first thermometer 14a, the second thermometer 14b, the work thermometer 15, and the environment thermometer 16. FIG. The temperature acquisition unit 22 outputs the acquired temperature to the single wafer processing unit 31 .

The thickness acquisition unit 23 acquires the thickness of the work 40 from the work thickness sensor 17 . The thickness acquisition unit 23 outputs the acquired thickness of the workpiece 40 to the sheet processing unit 31 .

The drive control unit 24 is a so-called servo driver, and controls the first servomotor 12a and the second servomotor 12b to the input positions. In other words, the first drive section and the second drive section or the first mold 11a and the second mold 11b are stopped at designated positions. The drive control unit 24 also obtains the torques output by the first servomotor 12a and the second servomotor 12b, and estimates the load of each servomotor. Furthermore, the drive control unit 24 outputs the estimated load to the sheet processing unit 31 .

(Configuration of control unit 30)
The single-wafer processing unit 31 is a functional block that reflects the previous press result of the press machine 10 to the next press by single-wafer processing. Specifically, the amount of wear and the amount of thermal deformation of the mold at the current temperature state are determined from the relationship between the change in thickness of the workpiece 40 before and after processing, the temperature of each part, the load of each servomotor, and the stress and strain of each material. , to guess. Here, the single-wafer processing is not batch processing for collectively processing a plurality of works, but processing for each work.

Moreover, if the relationship between stress and strain for each material cannot be given to the press machine 10 in advance, the relationship between stress and strain may be estimated from the amount of change in load and thickness before and after processing. In addition, elastic modulus, plastic modulus, yield stress or yield strength, etc. may also be estimated.

The single-wafer processing unit 31 also inputs the thickness of the workpiece 40 before processing. The single wafer processing unit 31 outputs to the stop position command unit 32 as information summarizing the amount of wear and thermal deformation of the mold, the elastic modulus, plastic coefficient, yield stress or proof stress of the workpiece 40, and the thickness of the workpiece 40. .

The stop position command unit 32 controls the first driving unit and the second driving unit based on information on the positions of the first mold 11a and the second mold 11b during pressing in addition to the information on the single wafer processing unit 31 for each press. is a functional block that determines the stop position of the The stop position command section 32 outputs the determined stop position to the drive control section 24 .

§3. Operation Example FIG. 3 is a flowchart showing the operation flow of the press 10 according to the first embodiment.

In S<b>11 , the single-wafer processing unit 31 measures the thickness and temperature of the new work 40 . The sheet processing unit 31 derives the elastic modulus of the new workpiece 40 based on the measurement results, and outputs the elastic modulus and thickness to the stop position command unit 32 .

In S12, the stop position command unit 32 acquires the previous wear amount and thermal deformation amount of the mold obtained from the single wafer processing unit 31, and the elastic coefficient, plastic coefficient, proof stress or yield stress, and thickness of the workpiece 40. Get various information. In addition to the various information, the stop position command unit 32 determines the stop position of the first mold and the stop position of the second mold from the positions of the first servomotor 12a and the second servomotor 12b acquired from the position acquisition unit 21. determine the position and After that, the stop position command section 32 outputs the stop position to the drive control section 24 . Next, the processes of S21 and S23 are performed in parallel.

In S21, the drive control unit 24 controls the first servomotor 12a with the input stop position as the target position.

In S22, the position acquisition unit 21 acquires the position of the first servomotor from the encoder of the first servomotor, and measures the position of the first mold 11a.

In S23, the drive control unit 24 controls the second servomotor 12b with the input stop position as the target position.

In S24, the position acquiring unit 21 acquires the position of the second servomotor from the encoder of the second servomotor, and measures the position of the second mold 11b.

In S31, the stop position command unit 32 determines from the positions of the first mold 11a and the second mold 11b whether both the first mold 11a and the second mold 11b have reached the target positions. If the target position is reached (Yes in S31), the process proceeds to S32. If the target position is not reached (No in S31), the process returns to S12. That is, the stop position command unit 32 keeps the first and second molds 11a and 11b until both the first mold 11a and the second mold 11b reach the target positions. 11b. Also, the second drive unit keeps changing the target position dynamically. Here, whether or not the target position has been reached is determined by whether the deviation between the position of each die and the target position has become equal to or less than a predetermined threshold in each drive unit.

In S32, the first mold 11a and the second mold 11b are made to wait at the target position for a predetermined time. Let this time be the stop time Twait.

In S<b>33 , the single-wafer processing unit 31 calculates the gap between the first mold 11 a and the second mold 11 b from the positions of the first mold 11 a and the second mold 11 b acquired from the position acquisition unit 21 .

In S34, the single-wafer processing unit 31 estimates the load applied to the workpiece 40 by the first mold 11a and the second mold 11b from the torques of the first servomotor 12a and the second servomotor 12b.

In S35, the drive control unit 24 operates the first mold 11a and the second mold 11b to open the molds.

In S36, the thickness acquisition unit 23 acquires the measured thickness of the workpiece 40 after processing.

In S<b>37 , the temperature acquisition unit 22 measures the first thermometer 14 a , the second thermometer 14 b and the environment thermometer 16 . Here, when the work temperature is measured again by the work thermometer 15, it is possible to correct the measurement amount due to the temperature and the deformation amount of the work due to the temperature, and calculate the wear amount and thermal deformation amount of the mold. There is an effect of improving the accuracy of deriving the local elastic modulus or plastic modulus, and the like.

In S38, the single wafer processing unit 31 calculates the amount of wear and the amount of thermal deformation of the first mold 11a and the second mold 11b.

At S39, the work 40 is discharged, and preparations are made for the next work 40 to be loaded.

§4. Action/Effect By repeating the processing from S12 to S31 until the condition of S31 is satisfied, the first mold 11a and the second mold 11b can be stopped at the target position. Here, the first driving unit that drives the first mold 11a has a faster driving speed than the second driving unit that drives the second mold 11b, but the resolution and/or repeatability are poor. have

Therefore, the first mold 11a is stopped first, and the stop position of the second mold can be determined in consideration of the stop position of the first mold 11a. Therefore, the error generated in the first driving section can be corrected by the second driving section, and the gap between the first mold and the second mold can be controlled with high precision. Since the gap is highly accurate, the product (workpiece 40) pressed by the press machine 10 is also highly accurate.

FIG. 4 is a graph showing changes in the positions of the first mold 11a and the second mold 11b according to the first embodiment. FIG. 5 is another graph showing changes in the positions of the first mold 11a and the second mold 11b according to the first embodiment.

In FIGS. 4 and 5, dashed lines represent changes in the ideal target position. As indicated by the dashed lines in FIGS. 4 and 5, the first mold 11a and the second mold 11b start moving simultaneously, the first mold descends, and the second mold ascends. At the target position, the first mold 11a and the second mold 11b are simultaneously stopped at the stop position. After the first mold 11a and the second mold 11b stop, the operation is stopped for a predetermined time, an external force is applied to the workpiece 40, the first mold rises, the second mold descends, The mold is opened so that the workpiece 40 can be taken out.

In FIG. 4, the solid line is the change in actual position. As shown by the solid line in FIG. 4, the first mold stops at the first mold stop position in a state where the first mold has gone too far below the change in the ideal target position. Therefore, the second mold corrects the target position below the ideal target position and stops at the second mold stop position. Therefore, the second mold stops later than the first mold.

In FIG. 5, the solid line is the change in actual position. As shown by the solid line in FIG. 5, the first mold does not reach the ideal target position change and stops at the upper first mold stop position. Therefore, the second mold corrects the target position above the ideal target position and stops at the second mold stop position. Therefore, the second mold stops later than the first mold.

As shown in FIGS. 4 and 5, the driving speed of the first driving unit is fast and the accuracy is not as high as that of the second driving unit, so the first mold stops at the first mold stop position deviated from the target position. Resulting in. Therefore, in order to eliminate the error between the target position of the first mold and the stop position of the first mold, based on the driving state of the first driving unit, the second driving unit keeps moving even after the first driving unit stops. Continue the operation to stop the second mold at the second mold stop position. By this operation, the press machine 10 according to the first embodiment can achieve both the processing speed and the processing accuracy. In order to achieve both machining speed and machining accuracy, the first drive section and the second drive section have different characteristics.

Here, the driving status of the first driving section is information such as the position or speed of the first mold driven by the first driving section. In addition, the second driving section causes the position of the second mold to follow the position of the first mold so as to reduce errors in accordance with the driving state of the first driving section, thereby correcting the stop position. That is, instead of changing the target position of the second drive unit only once when the first die is stopped by the first drive unit, the target position of the second drive unit is changed so as to dynamically reduce the error during pressing. changing position.

The different characteristics of the first drive section and the second drive section include, for example, the length of the lead of the ball screw or the machining accuracy of the ball screw. When the lead of the ball screw is long, the driving speed increases, but the stop position resolution decreases accordingly. On the other hand, if the lead of the ball screw is short, the drive speed will be slow, but the resolution of the stop position will be improved accordingly. In addition, the higher the machining accuracy of the ball screw, the higher the reproducibility, and the less variation the product can be produced.

Here, the relationship between the drive speeds or accuracies (resolution and repeatability) of the first drive unit and the second drive unit may be different from the above. That is, the first driving section may be driven with higher accuracy than the second driving section, and the second driving section may be driven at a higher speed than the first driving section. That is, one of the two molds is driven by the first driving section, and the other mold is driven by the second driving section. , and it is sufficient if the other can be driven with higher precision than the other.

In addition, by measuring various temperatures and the thickness of the workpiece before and after processing and reflecting the results for each press, it is possible to produce highly accurate products.

In addition, the load is estimated from the torque of the first servomotor 12a and the second servomotor 12b during pressing, and the relationship between stress and strain including the yield stress or proof stress of the workpiece 40 is calculated from the amount of deformation of each workpiece 40 before and after processing. can be inferred and applied to the next press for correction. Therefore, a highly accurate product can be produced by correction. At this time, instead of estimating the load from the torque of the first servomotor 12a and the second servomotor 12b, the load may be actually measured using a load cell or the like.

(Correction according to mold temperature)
High precision products are produced by correcting the target position according to the temperature of the first mold by the first thermometer 14a and the temperature of the second mold by the second thermometer 14b in the sheet processing unit 31. can.

The higher the temperature of the first mold and the second mold, the more the mold itself thermally expands, so the necessary gap (distance between the first mold and the second mold) should be narrowed. , a product of given dimensions can be obtained.

(Correction according to environmental temperature)
The first ball screw 13 a and the second ball screw 13 b also thermally expand according to the environmental temperature measured by the environmental thermometer 16 in the single-wafer processing unit 31 . Therefore, in order to produce high-precision products, it is necessary to correct the target position (necessary gap) according to the environmental temperature.

Since the leads of the first ball screw 13a and the second ball screw 13b become larger as the environmental temperature becomes higher, a product having a predetermined size can be obtained by narrowing the required gap.

Moreover, the relationship between the stress and strain of the workpiece 40 itself changes according to the temperature, and the yield stress or proof stress also changes according to the temperature. Therefore, the higher the workpiece temperature, the lower the elastic modulus in the elastic region of the workpiece 40 itself and the yield stress or proof stress in the plastic region. By taking into account these variations, a product of given dimensions can be obtained.

(Correction according to elastic modulus of workpiece 40)
The higher the modulus of elasticity of the workpiece 40, the higher the stress to be applied, so the required gap needs to be smaller. Further, the higher the elastic modulus of the work 40, the longer it takes to plastically deform the work 40, so the stop time Twait must be increased. By making these corrections, it is possible to obtain a product with the desired dimensions.

[Embodiment 2]
Other embodiments of the invention are described below. For convenience of description, members having the same functions as those of the members described in the above embodiments are denoted by the same reference numerals, and description thereof will not be repeated.

(Mechanical configuration of press machine 10a)
FIG. 6 is a schematic diagram showing the mechanical configuration of the press machine 10a according to the second embodiment. Unlike the press machine 10, the press machine 10a differs in the target driven by the second drive section, and the second drive section drives the first drive section. Also, in the press machine 10 a , unlike the press machine 10 , the second mold 11 b facing the lower surface of the workpiece 40 is fixed to the main body 19 . The first mold 11a is still driven by the first driving section.

Specifically, the second servomotor is fixed to the main body 19 and the first servomotor is not fixed to the main body 19 . The second ball screw 13b is assembled to drive the first servomotor 12a. Therefore, when the second servo motor 12b rotates the second ball screw 13b, the first servo motor 12a, the first ball screw 13a, and the first die 11a move up and down. Further, the first mold 11a moves up and down by rotating the first ball screw 13a by the first servomotor 12a. Therefore, the first mold 11a is driven by the first drive section and the second drive section, and the amount of movement thereof is the sum of the amounts of movement of the first drive section and the second drive section.

(Action and effect of the press machine 10a)
Also, in the press machine 10a, as in the press machine 10, the drive speed, resolution, repeatability, etc. of the first drive section and the second drive section are different. The second driving section has higher resolution and higher repeatability (higher accuracy) than the first driving section. On the other hand, the first driving section has a driving speed faster than that of the second driving section.

Therefore, in the press machine 10a as well as in the press machine 10, the gap between the first mold 11a and the second mold 11b is reduced at high speed by the first drive unit having a high driving speed. After that, the gap between the first mold 11a and the second mold 11b is finely adjusted by the second drive unit that drives with high accuracy, and the gap is made highly accurate.

Therefore, the press machine 10a according to the second embodiment can achieve both the machining speed and the machining accuracy, like the press machine 10 according to the first embodiment. Further, in the press machine 10a, since both the first driving section and the second driving section move the first mold 11a downward from above, it is characterized in that backlash caused by the ball screw hardly occurs. .

Here, the relationship between the driving speed or accuracy (resolution and repeatability) between the first driving section and the second driving section may be different from that described above. That is, the first driving section may be driven with higher accuracy than the second driving section, and the second driving section may be driven at a higher speed than the first driving section. That is, it is sufficient that one of the two molds is driven by the first driving section and the second driving section that are connected to each other, and the other mold is fixed. Here, it is sufficient that one of the first driving section and the second driving section can be driven at a higher speed than the other, and the other can be driven with higher precision than the other.

[Embodiment 3]
Other embodiments of the invention are described below. For convenience of description, members having the same functions as those of the members described in the above embodiments are denoted by the same reference numerals, and description thereof will not be repeated.

(Mechanical configuration of press machine 10b)
FIG. 7 is a block diagram showing the configuration of the essential parts of the press 10b according to the third embodiment. FIG. 8 is a schematic diagram showing the mechanical configuration of the press 10b according to the third embodiment. The press machine 10b is different from the press machine 10 in that it has a gap sensor 18 and a press controller 20b instead of the press controller 20 . Unlike the press controller 20, the press controller 20b includes a gap acquisition section 25. As shown in FIG.

The gap sensor 18 is a sensor that measures the distance (gap) between the first mold 11a and the second mold 11b. The gap sensor 18 may be a micrometer or the like.

The gap acquisition unit 25 acquires the gap measured by the gap sensor 18 . The gap acquisition unit 25 outputs the acquired gap to the sheet processing unit 31 and the stop position command unit 32 .

(Operation of press machine 10b)
In the first embodiment, the single wafer processing unit 31 estimates the gap from the positions of the first mold 11a and the second mold 11b acquired from the position acquisition unit 21 and uses it for correction. Measure the gap and use it for correction. Therefore, it is possible to actually measure and correct the influence of the mechanical backlash generated in the first drive section and the second drive section and the thermal expansion of the mold, so that a product with higher precision can be manufactured.

Similarly to the single-wafer processing unit 31, the stop position command unit 32 is controlled not by the positions of the first mold 11a and the second mold 11b, but by the gap between the first mold 11a and the second mold 11b. to drive the first driving section and the second driving section. Therefore, it is possible to actually measure and correct the influence of the mechanical backlash generated in the first drive section and the second drive section and the thermal expansion of the mold, so that a product with higher precision can be manufactured.

(Modification 1)
In the press machine 10b according to the third embodiment, the control is performed by the gap between the first mold 11a and the second mold 11b, so the first drive unit may be a cylinder that does not perform position control. Even in this case, the second driving section operates to interpolate the error generated in the first driving section. Therefore, the gap between the first mold 11a and the second mold 11b can be controlled by the gap sensor 18 and the second drive unit even if the first drive unit does not perform position control, so that highly accurate products can be manufactured. .

(Modification 2)
In the press machine according to the above-described embodiment, the configuration in which the work is vertically pressed by the first die and the second die has been described, but the present invention is not limited to this configuration. For example, the workpiece may be pressed in the left-right direction by the first mold and the second mold.

Specifically, the opposing surfaces of the first mold and the second mold are stepped with an upper step portion and a lower step portion. The upper part of the first mold is brought into contact with the upper part of the second mold, and the lower part of the first mold is brought into contact with the lower part of the second mold to form the first mold and the second mold. slide left and right toward each other. As a result, the workpiece is pressed in the left-right direction between the lower part of the first mold and the upper part of the second mold.

In addition, in the above-described embodiment, the first mold and the second mold are configured to move in the vertical direction, but the present invention is not limited to this. A configuration in which the second mold moves may be used.

In addition, in the above-described embodiment, the first mold and the second mold are configured such that the opposing surfaces are provided on a horizontal plane, but the present invention is not limited to this, and may be provided on a vertical plane, for example. .

[Additional notes]
The present invention is not limited to the above-described embodiments, but can be modified in various ways within the scope of the claims, and can be obtained by appropriately combining technical means disclosed in different embodiments. is also included in the technical scope of the present invention.

10, 10a, 10b press machine 11a first mold 11b second mold 12a first servo motor (first drive unit)
12b second servo motor (second drive unit)
13a first ball screw (first drive unit)
13b Second ball screw (second drive unit)
14a first thermometer 14b second thermometer 15 work thermometer 16 environment thermometer 17 work thickness sensor 18 gap sensor 19 main body 20, 20b press controller 21 position acquisition unit 22 temperature acquisition unit 23 thickness acquisition unit 24 drive unit 25 gap acquisition Section 30 Control Section 31 Single Wafer Processing Section 32 Stop Position Command Section 40 Work

Claims (9)

two dies facing each other for pressing the workpiece;
a first drive section and a second drive section for driving at least one of the two molds;
a control unit that controls the first drive unit and the second drive unit,
The first drive section can be driven at a higher speed than the second drive section,
The second drive section can be driven with higher precision than the first drive section,
The press machine, wherein the control section changes a stop position of the die driven by the second driving section based on the driving status of the first driving section. 2. The press according to claim 1, wherein one of said two dies is driven by said first driving section and the other of said two dies is driven by said second driving section. One of the two molds is driven by the first driving section and the second driving section,
2. A press according to claim 1, wherein the other of said two dies is fixed. The press machine according to any one of claims 1 to 3, wherein the drive status of the first drive section is the position or speed of the die driven by the first drive section. The press machine according to any one of claims 1 to 4, wherein the control section stops the second driving section after the first driving section stops. The control unit controls the stop position of the mold driven by the second drive unit by adjusting the elastic modulus, plastic modulus, yield stress or proof stress of the work, the temperature of each of the two molds, and the temperature of the work. , and the ambient temperature. The press machine according to any one of claims 1 to 6, wherein the control section changes the stop position of the die driven by the second driving section at least once during one press. The press machine according to any one of claims 1 to 7, wherein the control section can control a stop position of the die driven by the first drive section. A control method for a press having two dies facing each other for pressing a workpiece, comprising:
The press machine
a first drive section and a second drive section for driving at least one of the two molds;
a control unit that controls the first drive unit and the second drive unit,
The first drive section can be driven at a higher speed than the second drive section,
The second drive section can be driven with higher precision than the first drive section,
a step of acquiring the driving status of the first driving unit;
and changing a stop position of the second driving unit based on the driving condition.

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